This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 21 |
| 5 | 52 |
| 6 | 131 |
| 7 | 316 |
| 8 | 765 |
| 9 | 1846 |
| 10 | 4494 |
| 11 | 10944 |
| 12 | 26654 |
| 13 | 64798 |
| 14 | 157502 |
| 15 | 382868 |
| 16 | 931028 |
| 17 | 2264106 |
| 18 | 5505777 |
| 19 | 13387880 |
| 20 | 32553601 |
| 21 | 79156974 |
| 22 | 192479838 |
| 23 | 468039888 |
| 24 | 1138098210 |
| 25 | 2767421826 |
| 26 | 6729311459 |
| 27 | 16363118556 |
| 28 | 39788886610 |
| 29 | 96751470494 |